gpu: Add SequenceId for identifying sync point sequences.

gpu/ipc/in_process_command_buffer.h

Index: gpu/ipc/in_process_command_buffer.h
diff --git a/gpu/ipc/in_process_command_buffer.h b/gpu/ipc/in_process_command_buffer.h
index daf3d0019b2b854890492b7eb8d2d54ca3d6b9a2..a17d85ecd9f20b1acfa58a65f813c6b8751b68a1 100644
--- a/gpu/ipc/in_process_command_buffer.h
+++ b/gpu/ipc/in_process_command_buffer.h
@@ -51,7 +51,7 @@ class Size;
 
 namespace gpu {
 
-class SyncPointClient;
+class SyncPointClientState;
 class SyncPointOrderData;
 class SyncPointManager;
 struct GpuProcessHostedCALayerTreeParamsMac;
@@ -276,7 +276,7 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
   scoped_refptr<gl::GLContext> context_;
   scoped_refptr<gl::GLSurface> surface_;
   scoped_refptr<SyncPointOrderData> sync_point_order_data_;
-  std::unique_ptr<SyncPointClient> sync_point_client_;
+  scoped_refptr<SyncPointClientState> sync_point_client_state_;
   base::Closure context_lost_callback_;
   // Used to throttle PerformDelayedWorkOnGpuThread.
   bool delayed_work_pending_;